Question

why kcl and kno3 are used in salt bridge

Answer 1

The main function of salt bridge is to maintain neutrality of the system .So , it provides negative ions to excess positive charge and positive ions to excess negative charge ,hence,keeping the system neutralised. For this reason KCL / KNO3 are used in a salt bridge .KCL breaks into K+ and CL - and the +ve K part goes to the negative side whereas , the -ve CL part goes to the postive side maintaining neutrality.